Christmas tension between Prince Harry and Prince William

Reports of tension between the young royals are growing, this time with claims Prince Harry wasn't happy with how Prince William treated Meghan Markle during her first Christmas with the family.

The conflict could explain why the Duke and Duchess of Sussex have decided to leave Kensington Palace and instead move to Frogmore Cottage in Windsor.

"There has been a bit of tension between the brothers," the Sun reports. "Now Harry and Meghan don't want to live next to William and Kate and want to strike out on their own.

In the latest episode of The Windsors, 9Honey takes you through the evolution of Prince Harry from 'party prince' to devoted husband. (Article continues.)

"They need more room and hope Frogmore Cottage will be ready in time for when they have the baby."

A royal spokesperson commented on the move, saying, "Windsor is a very special place for Their Royal Highnesses and they are grateful that their official residence will be on the estate. The Duke and Duchess’s office will continue to be based at Kensington Palace."

Harry and Meghan's first child is due in April, 2019.

A mutual friend of the princes claims there has been tension. (Getty)

There have also been claims of a 'royal rift' between the Duchesses, with a source telling Vanity Fair the sisters-in-law have trouble getting along.

"Kate and Meghan are very different people and they don't have a lot in common but they have made an effort to get along," the source said. "Any issues are between the brothers."

The young royals have been credited with reinvigorating the royal family's place in the world, so persistent rumours of tension are disappointing to say the least, particularly when it affects the relationship between Prince William and Prince Harry.

Prince Harry and Meghan Markle announced they were moving out of Kensington Palace. (Getty)

Things reportedly came to a head during Meghan's first Christmas with the royal family, with Vanity Fair quoting a mutual friend who explained the incident.

"Harry felt William wasn't rolling out the red carpet for Meghan and told him so," they said. "They had a bit of a fall out which was only resolved when Charles stepped in and asked William to make an effort.

"That's when the Cambridges invited the Sussexes to spend Christmas with them."